It’s true – they’re a … oh, what’s that beautiful shape called… well, they’re https://en.wikipedia.org/wiki/Borromean_rings – but it shows up in a lot of places. It might be a trinity knot? all I can remember is the rings. Oh! See: https://en.wikipedia.org/wiki/Efimov_state for the graphic on the Halo Effect – I made that – it’s a good example of ‘three’ building on each other for exponential growth.